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Shake-Table Collapse Tests of a Reduced-Scale, 4-Story Steel Moment-Resisting Frame
https://orcid.org/http://orcid.org/0000-0002-9254-8844
https://orcid.org/http://orcid.org/0000-0002-7866-9332
https://orcid.org/http://orcid.org/0009-0008-3104-6470
https://orcid.org/http://orcid.org/0000-0001-8448-4919
Shake-table tests of a steel moment-resisting frame were conducted to obtain detailed data on the occurrence and propagation of damage leading to the collapse of steel structures. A 2/5-scale, 4-story, 2-bay, planar specimen was subjected to in-plane, unidirectional ground motions. The specimen was intended to sustain very large deformations, or story drift ratio greater than 0.10 rad, and avoid a first-story collapse mechanism. The specimen comprised I-section beams and square-HSS columns. As in typical Japanese construction, the Complete Joint Penetration (CJP) groove welds between the beam flanges and column diaphragm plates were completed with no weld-access-hole. The ground motions included the JMA Kobe NS record scaled from 10 to 100% and white noise excitations. The 100%-scale record was repeated four times. Each of the 100% motions induced significant yielding of the beams, columns, and some column panels, which resulted in story drift of +0.08 and −0.02 rad, and added a residual story drift of +0.02 rad. Although beam fracture occurred at two locations on the second floor, and the maximum story drift reached +0.15 rad, the specimen did not collapse due to the high strength of the columns. The fundamental period remained constant until beam fracture occurred. Supplementary tests were conducted on beam-column subassemblages constructed from the same materials and fabrication process as the shake-table specimen. The subassemblages exhibited more rapid development of local buckling deformation and associated strength degradation due to axial deformation restraint in the shake-table test beams that was not present in the subassemblage tests.
Shake-Table Collapse Tests of a Reduced-Scale, 4-Story Steel Moment-Resisting Frame
https://orcid.org/http://orcid.org/0000-0002-9254-8844
https://orcid.org/http://orcid.org/0000-0002-7866-9332
https://orcid.org/http://orcid.org/0009-0008-3104-6470
https://orcid.org/http://orcid.org/0000-0001-8448-4919
Shake-table tests of a steel moment-resisting frame were conducted to obtain detailed data on the occurrence and propagation of damage leading to the collapse of steel structures. A 2/5-scale, 4-story, 2-bay, planar specimen was subjected to in-plane, unidirectional ground motions. The specimen was intended to sustain very large deformations, or story drift ratio greater than 0.10 rad, and avoid a first-story collapse mechanism. The specimen comprised I-section beams and square-HSS columns. As in typical Japanese construction, the Complete Joint Penetration (CJP) groove welds between the beam flanges and column diaphragm plates were completed with no weld-access-hole. The ground motions included the JMA Kobe NS record scaled from 10 to 100% and white noise excitations. The 100%-scale record was repeated four times. Each of the 100% motions induced significant yielding of the beams, columns, and some column panels, which resulted in story drift of +0.08 and −0.02 rad, and added a residual story drift of +0.02 rad. Although beam fracture occurred at two locations on the second floor, and the maximum story drift reached +0.15 rad, the specimen did not collapse due to the high strength of the columns. The fundamental period remained constant until beam fracture occurred. Supplementary tests were conducted on beam-column subassemblages constructed from the same materials and fabrication process as the shake-table specimen. The subassemblages exhibited more rapid development of local buckling deformation and associated strength degradation due to axial deformation restraint in the shake-table test beams that was not present in the subassemblage tests.
Shake-Table Collapse Tests of a Reduced-Scale, 4-Story Steel Moment-Resisting Frame
https://orcid.org/http://orcid.org/0000-0002-9254-8844
https://orcid.org/http://orcid.org/0000-0002-7866-9332
https://orcid.org/http://orcid.org/0009-0008-3104-6470
https://orcid.org/http://orcid.org/0000-0001-8448-4919
Shake-table tests of a steel moment-resisting frame were conducted to obtain detailed data on the occurrence and propagation of damage leading to the collapse of steel structures. A 2/5-scale, 4-story, 2-bay, planar specimen was subjected to in-plane, unidirectional ground motions. The specimen was intended to sustain very large deformations, or story drift ratio greater than 0.10 rad, and avoid a first-story collapse mechanism. The specimen comprised I-section beams and square-HSS columns. As in typical Japanese construction, the Complete Joint Penetration (CJP) groove welds between the beam flanges and column diaphragm plates were completed with no weld-access-hole. The ground motions included the JMA Kobe NS record scaled from 10 to 100% and white noise excitations. The 100%-scale record was repeated four times. Each of the 100% motions induced significant yielding of the beams, columns, and some column panels, which resulted in story drift of +0.08 and −0.02 rad, and added a residual story drift of +0.02 rad. Although beam fracture occurred at two locations on the second floor, and the maximum story drift reached +0.15 rad, the specimen did not collapse due to the high strength of the columns. The fundamental period remained constant until beam fracture occurred. Supplementary tests were conducted on beam-column subassemblages constructed from the same materials and fabrication process as the shake-table specimen. The subassemblages exhibited more rapid development of local buckling deformation and associated strength degradation due to axial deformation restraint in the shake-table test beams that was not present in the subassemblage tests.
Shake-Table Collapse Tests of a Reduced-Scale, 4-Story Steel Moment-Resisting Frame
Lecture Notes in Civil Engineering
Mazzolani, Federico M. (editor) / Piluso, Vincenzo (editor) / Nastri, Elide (editor) / Formisano, Antonio (editor) / Somarriba, Martin (author) / Okazaki, Taichiro (author) / Nagae, Takuya (author) / Matsumiya, Tomohiro (author) / Takahashi, Noriyuki (author)
International Conference on the Behaviour of Steel Structures in Seismic Areas ; 2024 ; Salerno, Italy
2024-07-03
12 pages
Article/Chapter (Book)
Electronic Resource
English
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